I have training in self-defense and I also know how to use all of the firearms my parents own. I live in the middle of the country(the boonies!) and have no nieghbors that could readily know I need help or am in danger. It is better to know self defense and how to use a firearm and not need it than to not know and need it.
As we say alot in the Fire service "It is better safe than sorry"
You have everything that you need for self defense....if you are on an EMS call and things get dicey....you put your aid bag between you and the danger and then you get the hell out in a hurry....the goal is to give you AND your crew enough time to exit the scene.....forget patient care for the time being...your safety is goal #!...hard to do but that's the way it is....
Yes, I have not yet seen a Dept. that actually mandates a self defense or a entire class on scene safety. I truelly believe that NREMT should offer EMS CEU's for self defence class's. Working a few years in a large city of approx. 105000 people, there where a few times I had to back out of a call because the scene became unsafe.
I haven't had a chance to read the other replies, but an EMS based self-defense class can teach you to not only how to protect yourself, but also when it is appropriate to defend yourself, and how to do so with the least amount of injury to your patient. It is not always a crazed attacker we need to defend ourselves from sometimes it is a head injured patient or a patient coming out of a seizure. Sometimes we have to protect ourselves from patients and patients from themselves. My advice is training is always good and if you seek out a quality training (self-defense from someone in EMS, medicine, or the police force) they will train you for both attackers and patients.
Self defense The 2 1/2 with a straight bore does wonders but Check out the video in the group "the lighter side of firefighting" I have the ultimate tool for your pocket!!!!! check it out
You'd be much better getting trained in conflict management. If you need self-defence things ahave gone to far.
A funny story around that, Calgary (Canada) took to employing ex London Bobbies as cops and one of the side effects was that in a tense situations, hearing a British accent was so out of place that generaly the incident instantly cooled down.
Now I'm not advocating that your learn a British accent, the point is, with training, a tense situation can be stopped from becoming a brawl if you handle it right.
Avoidance is the best option. Try to be aware of your surroundings. There's a good book I would recommend called "The Gift of Fear" by Gavin de Becker. Here's a link to a popular online bookseller that also has an interview with the author. http://www.amazon.com/Gift-Fear-Gavin-Becker/dp/0440226198
The book basically tells you to listen to that 6th sense. It's been a few years since I've read it. I might have to dig it out for a refresher!
Other than that, I'd say contact the local constabulary/police/po-po. Martial arts schools would be another source for self defense techniques but be careful. I've been involved with martial arts since 1987. I've seen many schools teach what passes for self defense that would get you injured or worse. If the school is more focused on tournaments than practical defense, keep searching.
Unfortunately, nowadays criminals have more rights than the rescuers so be careful you don't take things too far. How far is too far? Depends on the DA/judge/jury.